标题： 有各向异性毛发的膨胀宇宙 显示英文标题

标题： Inflationary Universe with Anisotropic Hair

摘要： 我们研究了一个矢量场与暴胀场耦合的暴胀情景，并表明对于广泛的耦合函数，暴胀宇宙具有各向异性。 这种各向异性暴胀是一个跟踪解，无论初始条件如何，矢量场的能量密度都跟随暴胀场的能量密度。 我们发现各向异性与暴胀的慢滚参数之间存在普遍关系。 我们的发现具有观测意义，并为宇宙无发 conjecture 提供了一个反例。 显示英文摘要

摘要： We study an inflationary scenario with a vector field coupled with an inflaton field and show that the inflationary universe is endowed with anisotropy for a wide range of coupling functions. This anisotropic inflation is a tracking solution where the energy density of the vector field follows that of the inflaton field irrespective of initial conditions. We find a universal relation between the anisotropy and a slow-roll parameter of inflation. Our finding has observational implications and gives a counter example to the cosmic no-hair conjecture.